Molecular geometry, polarity
MULTIPLE CHOICE QUESTIONS
Topic: Molecular geometry, polarity
Section: 2.3
Difficulty Level: Easy
1. Which molecule does not have a dipole moment?
F
A)
F
F
B) F
C)
F
D) F
F
E) None of these
Ans: D
Topic: Molecular geometry, polarity
Section: 2.3
Difficulty Level: Easy
2.
A)
B)
C)
D)
E)
Of the following solvents which one does not have a zero dipole moment?
Pentane
Cyclohexane
Diethyl ether
Cyclopentane
None of these
Ans: C
Topic: Molecular geometry, polarity
Section: 2.3
Difficulty Level: Easy
3.
A)
B)
C)
D)
E)
Which molecule has a zero dipole moment?
CH3Cl
CH2Cl2
CHCl3
CCl4
None of these
Ans: D
Topic: Molecular geometry, dipole moment
Section: 2.3
Difficulty Level: Easy
4. Which molecule would you expect to have no dipole moment (i.e.,  = 0 D)?
A) CHF3
H
B) F
H
C) :NF3
D) F
H
E) CH2F2
Ans: B
F
F
H
Topic: Molecular geometry, dipole moment
Section: 2.3
Difficulty Level: Easy
5. Which molecule has a dipole moment greater than zero?
F
A) F
H
B) F
C)
H
H
F
F
H
H
H
F
D) More than one of these
E) None of these
Ans: D
Topic: Molecular geometry, dipole moment
Section: 2.3
Difficulty Level: Medium
6. Which of the following would have no net dipole moment
( = 0 D)?
A) CBr4
B) cis-1,2-Dibromoethene
C) trans:-1,2-Dibromoethene
D) 1,1-Dibromoethene
E) More than one of these
Ans: E
Topic: Molecular geometry, polarity
Section: 2.3
Difficulty Level: Medium
7. For a molecule to possess a dipole moment, which following condition is necessary but
not sufficient?
A) Three or more atoms in the molecule
B) Presence of one or more polar bonds
C) A non-linear structure
D) Presence of oxygen or fluorine
E) Absence of a carbon-carbon double or triple bond
Ans: B
Topic: Molecular geometry, polarity
Section: 1.5 and 2.3
Difficulty Level: Easy
8.
A)
B)
C)
D)
E)
Which molecule has a zero dipole moment?
SO2
CO2
CO
CHCl3
None of these
Ans: B
Topic: Molecular geometry, polarity
Section: 1.5 and 2.3
Difficulty Level: Easy
9.
A)
B)
C)
D)
Which molecule has a zero dipole moment?
CO2
CH4
CH3CH3
E) All of these
Ans: E
Topic: Molecular geometry, polarity
Section: 1.5 and 2.3
Difficulty Level: Medium
10.
A)
B)
C)
D)
E)
Which molecule has a dipole moment of zero?
CHCl3
CH2Cl2
ClHC=CH2
trans-ClHC=CHCl
None of these
Ans: D
Topic: Molecular geometry, polarity
Section: 1.5 and 2.3
Difficulty Level: Medium
11.
A)
B)
C)
D)
E)
Which molecule would have a dipole moment greater than zero?
BeCl2
BCl3
CO2
H2O
CCl4
Ans: D
Topic: Molecular geometry, polarity
Section: 1.5, 1.6 and 2.3
Difficulty Level: Medium
12.
A)
B)
C)
D)
E)
A non-zero dipole moment is exhibited by:
SO2
CO2
CCl4
BF3
Cl
Cl
Cl
Cl
Ans: A
Topic: Molecular geometry, polarity
Section: 1.5, 1.6, and 2.3
Difficulty Level: Hard
13. Of the following common organic solvents which one is predicted to have a smaller
dipole moment?
A) Chloroform, CHCl3
B) Acetone, (CH3)2CO
C) Dimethylsulfoxide, (CH3)2SO
D) Acetonitrile, CH3CN
E) Methanol, CH3OH
Ans: A
Topic: Molecular geometry, Polarity
Section: 2.3A
Difficulty Level: Easy
14. Which molecule(s) has/have dipole moment(s) equal to zero?
Cl
A)
B) Cl
Cl
C)
Cl
Cl
Cl
D) Cl
Cl
E) None of these have dipole moment equal to zero.
Ans: C
Topic: Functional groups
Section: 2.4
Difficulty Level: Easy
15. What alkyl groups make up the following ether?
O
A)
B)
C)
D)
E)
ethyl and phenyl
propyl and benzyl
ethyl and benzyl
propyl and phenyl
None of these
Ans: C
Topic: Functional groups
Section: 2.4
Difficulty Level: Medium
16. What alkyl groups make up the following ketone?
Ph
O
A)
B)
C)
D)
E)
Phenyl, pentyl
Hexyl, phenyl
Benzyl, hexyl
Benzyl, heptyl
None of these
Ans: C
Topic: Functional groups
Section: 2.4A
Difficulty Level: Easy
17. What alkyl groups make up the following ether?
O
A)
B)
C)
D)
E)
Isobutyl and methyl
Methyl and butyl
Ethyl and isopropyl
Methyl and sec-butyl
None of these
Ans: D
Topic: Functional groups
Section: 2.4A
Difficulty Level: Easy
18. What alkyl groups make up the following ether?
O
A)
B)
C)
D)
E)
isobutyl and propyl
propyl and butyl
ethyl and isopropyl
propyl and sec-butyl
None of these
Ans: A
Topic: Functional groups
Section: 2.4A
Difficulty Level: Easy
19. What alkyl group is attached to the oxygen in the following ester?
O
O
A)
B)
C)
D)
E)
ethyl
propyl
sec-propyl
isopropyl
None of these
Ans: D
Topic: Functional groups
Section: 2.4A
Difficulty Level: Easy
20. What alkyl groups make up the following 3o amine?
N
A)
B)
C)
D)
E)
sec-butyl, ethyl, propyl
isobutyl, isopropyl, ethyl
sec-butyl, ethyl, isopropyl
butyl, ethyl, propyl
None of these
Ans: A
Topic: Functional groups
Section: 2.4A
Difficulty Level: Easy
21. What alkyl groups are attached to the benzene ring in the following example?
H3CH2CH2C
A)
B)
C)
D)
E)
ethyl, butyl
ethyl, isobutyl
proplyl, sec-butyl
propyl, butyl
None of these
Ans: E
Topic: Functional groups
Section: 2.4B
Difficulty Level: Medium
22. What common group is attached to both the ether and 3o amine in the following molecule?
OCH2C6H5
NBn
A)
B)
C)
D)
E)
benzyl
phenyl
heptyl
ethyl
None of these
Ans: A
Topic: Functional groups
Section: 2.4B
Difficulty Level: Medium
23. What group makes up the following aldehyde (benzaldehyde)?
C6H5CHO
A) benzyl
B) phenyl
C) heptyl
D) ethyl
E) None of these
Ans: B
Topic: Functional groups
Section: 2.5
Difficulty Level: Easy
24. What functional group is present in the following compound?
Br
A)
B)
C)
D)
E)
o
1 alkyl bromide
2o alcohol
2o alkyl bromide
1o amine
3o alkyl bromide
Ans: C
Topic: Functional Groups
Section: 2.5
Difficulty Level: Easy
25. Which is a 3 alkyl halide?
F
Br
Cl
I
II
III
I
Br
IV
A)
B)
C)
D)
E)
I
II
III
IV
V
Ans: B
Topic: Functional groups
Section: 2.5
Difficulty Level: Medium
V
26. Which compound(s) contain(s) tertiary carbon atom(s)?
F
I
II
III
Br
OH
OH
IV
A)
B)
C)
D)
E)
V
I, II, III
I
II, III
I, IV
V
Ans: D
Topic: Functional groups
Section: 2.5
Difficulty Level: Medium
27. Which of these compounds is a secondary alkyl chloride?
A) CH3CH2CH2CH2CH2Cl
CH3
B)
CH3CCH2CH3
Cl
C) CH3CHCH2CH2CH3
Cl
D) (CH3)2CHCHClCH3
E) Two of these
Ans: E
Topic: Functional groups, Isomerism
Section: 1.3A and 2.5
Difficulty Level: Medium
28.
A)
B)
C)
D)
E)
How many 2º alkyl bromides, neglecting stereoisomers, exist with the formula C6H13Br?
4
5
6
7
8
Ans: C
Topic: Isomers
Section: 1.3A and 2.5
Difficulty Level: Medium
29. The number of unique open-chain structures corresponding to the molecular formula
C3H5Cl is:
A) 2
B) 3
C) 4
D) 5
E) 6
Ans: C
Topic: Functional groups
Section: 2.6
Difficulty Level: Easy
30. Which compound listed below is a secondary alcohol?
A) CH3CHCH2CH3
OH
CH
CHCH
B)
3
2OH
C)
CH3
CH3
CH3COH
CH3
D) CH3CH2CH2CH2OH
E) CH3CH2CH2OCH3
Ans: A
Topic: Functional groups
Section: 2.6
Difficulty Level: Easy
31. What functional group is present in the following compound?
HO
A)
B)
C)
D)
E)
1o alcohol
ether
2o alcohol
ester
3o alcohol
Ans: E
Topic: Functional groups
Section: 2.6
Difficulty Level: Medium
32. Which compound is a tertiary alcohol?
CH3
OH
H3CH2C O
HO
CH3
I
II
III
O
IV
A)
B)
C)
D)
E)
I
II
III
IV
V
Ans: E
Topic: Functional groups
Section: 2.1 and 2.6
Difficulty Level: Easy
OH
V
33. What functional group(s) is/are present in the following compound?
OH
A)
B)
C)
D)
E)
alkyne and 2o alcohol
alkyne and 1o alcohol
2o alcohol and alkene
nitrile and 1o alcohol
alkene and 2o alcohol
Ans: A
Topic: Functional groups
Section: 2.5 and 2.6
Difficulty Level: Easy
34. A tertiary carbon atom is present in which of these compounds?
Cl
I
Cl
II
III
OH
HO
IV
A)
B)
C)
D)
E)
I
II, IV
III, V
IV
All of these
Ans: C
Topic: Functional groups
Section: 2.5 and 2.6
Difficulty Level: Easy
V
35. What functional group(s) is/are present in the following compound?
Cl
OH
A)
B)
C)
D)
E)
1o alcohol and 2o alkyl chloride
ether and 2o alcohol
1o alkyl chloride and 1o alcohol
1o alkyl chloride and 2o alcohol
None of these
Ans: D
Topic: Functional groups, Isomerism
Section: 1.3A, 2.6, and 2.7
Difficulty Level: Easy
36.
A)
B)
C)
D)
E)
How many constitutional isomers are possible with the formula C4H10O?
3
4
5
6
7
Ans: E
Topic: Functional groups
Section: 2.8
Difficulty Level: Easy
37. Which compound is a secondary amine?
A) CH3CH2CH2NH2
B) CH3CHCH3
NH2
C) CH3CH2NH
CH3
H
C
N
CH3
D) 3
CH3
E) CH3CH2CHNH2
CH3
Ans: C
Topic: Functional groups
Section: 2.8
Difficulty Level: Easy
38. Which compound is a primary amine with the formula C5H13N?
H2N
NH
H2N
I
II
III
N
IV
A)
B)
C)
D)
E)
NH2
V
I
II
III
IV
V
Ans: C
Topic: Functional groups
Section: 2.8
Difficulty Level: Easy
39. What functional group is present in the following compound?
N
H
A)
B)
C)
D)
E)
1o alkyl bromide
2o amine
nitrile
1o amine
3o amine
Ans: B
Topic: Functional groups
Section: 2.8
Difficulty Level: Easy
40. What functional group is present in the following compound?
N
A)
B)
C)
D)
E)
1o alkyl bromide
2o amine
nitrile
1o amine
3o amine
Ans: E
Topic: Functional groups
Section: 2.8
Difficulty Level: Easy
41. Which is a 3 amine?
NH2
H2N
NH
I
II
III
NH2
O
N
IV
A)
B)
C)
D)
E)
I
II
III
IV
V
Ans: D
Topic: Functional groups
Section: 2.8
Difficulty Level: Easy
V
42. An example of a tertiary amine is:
H
N
NH2
I
II
NH2
IV
A)
B)
C)
D)
E)
H2N
III
N
V
I
II
III
IV
V
Ans: E
Topic: Functional groups
Section: 2.7 and 2.8
Difficulty Level: Easy
43. What functional group(s) is/are present in the following compound?
NCH3
O
A)
B)
C)
D)
E)
ether and 2o amine
ester and 3o amine
3o amine
3o amine and ether
None of these
Ans: D
Topic: Functional groups
Section: 2.9
Difficulty Level: Easy
44. Which compound is a ketone?
A) O
C OH
H
O
B)
C)
CH3CCH2CH3
O
HCOCH3
D) O
C H
H
E) H3C
CH OH
H 3C
Ans: B
Topic: Functional groups
Section: 2.9
Difficulty Level: Easy
45. Which compound is an aldehyde?
O
O
O
NH
O
I
II
III
O
OH
A)
B)
C)
D)
E)
IV
I
II
III
IV
V
Ans: D
V
Topic: Functional groups
Section: 2.9
Difficulty Level: Medium
46. What functional group is present in the following compound?
CHO
A)
B)
C)
D)
E)
alcohol
ketone
aldehyde
ester
ether
Ans: C
Topic: Functional groups
Section: 2.9
Difficulty Level: Medium
47. What functional group is present in the following compound?
COCH3
A)
B)
C)
D)
E)
alcohol
ketone
aldehyde
ester
ether
Ans: B
Topic: Functional groups
Section: 2.1 and 2.9
Difficulty Level: Medium
48. What functional group(s) is/are present in the following compound?
OHC
A)
B)
C)
D)
E)
Ketone and alkene
Ketone and alkyne
Aldehyde and alkene
Aldehyde and alkyne
1o alcohol and alkene
Ans: C
Topic: Functional groups
Section: 2.1, 2.6, and 2.9
Difficulty Level: Easy
49. The compound below is an adrenocortical hormone called cortisone. Which functional
group is not present in cortisone?
OH
O
OH
O
O
A)
B)
C)
D)
E)
1 alcohol
Ketone
3 alcohol
Carboxylic acid
Alkene
Ans: D
Topic: Functional groups
Section: 2.1, 2.6, and 2.9
Difficulty Level: Easy
50. Which functional groups are present in the following compound?
OH
O
H
A)
B)
C)
D)
E)
Alkene, 1º alcohol, ketone
Alkene, 2º alcohol, aldehyde
Alkene, 2º alcohol, ketone
Alkyne, 1º alcohol, aldehyde
Alkyne, 2º alcohol, ketone
Ans: B
Topic: Functional groups
Section: 2.1, 2.6, and 2.9
Difficulty Level: Easy
51. The compound shown below is the male sex hormone, testosterone.
OH
O
O
A)
B)
C)
D)
E)
In addition to a cycloalkane skeleton, testosterone also contains the following functional
groups:
Alkene, ester, tertiary alcohol.
Alkene, ether, secondary alcohol.
Alkene, ketone, secondary alcohol.
Alkyne, ketone, secondary alcohol.
Alkene, ketone, tertiary alcohol.
Ans: C
Topic: Functional groups
Section: 2.1, 2.6, and 2.9
Difficulty Level: Medium
52. The compound shown below is a synthetic estrogen. It is marketed as an oral
contraceptive under the name Enovid.
OH
O
A)
B)
C)
D)
E)
In addition to an alkane (actually cycloalkane) skeleton, the Enovid molecule also
contains the following functional groups:
Ether, alcohol, alkyne.
Aldehyde, alkene, alkyne, alcohol.
Alcohol, carboxylic acid, alkene, alkyne.
Ketone, alkene, alcohol, alkyne.
Amine, alkene, ether, alkyne.
Ans: D
Topic: Functional Groups
Section: 2.7 and 2.9
Difficulty Level: Easy
53. Many organic compounds contain more than one functional group. Which of the
following is/are both an aldehyde and an ether?
O
O
O
O
O
I
O
II
III
O
O
O
OCH3
O
V
IV
A)
B)
C)
D)
E)
I
II, IV
V
I, V
III
Ans: A
Topic: Functional groups
Section: 2.10A
Difficulty Level: Easy
54. Which is a carboxylic acid?
OH
O
OH
O
O
I
O
II
III
O
O
O
OH
IV
A)
B)
C)
D)
E)
I
II
III
IV
V
Ans: E
Topic: Functional groups
Section: 2.10A
Difficulty Level: Medium
V
55. What functional group(s) is/are present in the following compound?
CO2H
A)
B)
C)
D)
E)
1o alcohol and ketone
carboxylic acid
ester
1o alcohol and aldehyde
alcohol
Ans: B
Topic: Functional groups
Section: 2.10A
Difficulty Level: Medium
56. What functional group(s) is/are present in the following compound?
HO2C
A)
B)
C)
D)
E)
1o alcohol and ketone
ester
carboxylic acid
1o alcohol and aldehyde
alcohol
Ans: C
Topic: Functional groups
Section: 2.1, 2.6, 2.9, and 2.10A
Difficulty Level: Medium
57. Which functional group is not contained in prostaglandin E1?
O
H
O
HO
H
A)
B)
C)
D)
E)
H
OH
H OH
Prostaglandin E1
Ketone
2 alcohol
3 alcohol
Carboxylic acid
Alkene
Ans: C
Topic: Functional groups
Section: 2.10B
Difficulty Level: Easy
58. What functional group(s) is/are present in the following compound?
O
O
A)
B)
C)
D)
E)
ether and ketone
carbonyl and ether
carboxylic acid and ether
ester
1o alcohol
Ans: D
Topic: Functional groups
Section: 2.10B
Difficulty Level: Easy
59. Which compound is an ester?
O
O
O
NH
O
I
II
III
O
OH
IV
A)
B)
C)
D)
E)
V
I
II
III
IV
V
Ans: C
Topic: Functional groups
Section: 2.10B
Difficulty Level: Medium
60. What functional group is present in the following compound?
CO2CH3
A)
B)
C)
D)
E)
alcohol
ketone
aldehyde
ester
ether
Ans: D
Topic: Functional groups
Section: 2.6 and 2.10B
Difficulty Level: Medium
61. What functional group(s) is/are present in the following compound?
CO2CH2CH3
OH
A)
B)
C)
D)
E)
Ketone and 1o alcohol
Ether and alcohol
Ester and ether
Ester and 1o alcohol
1o alcohol and aldehyde
Ans: D
Topic: Functional groups
Section: 2.9 and 2.10B
Difficulty Level: Medium
62. Which compound can be classified as an ester as well as a ketone?
O
O
O
O
O
O
I
II
O
III
O
O
O
O
IV
A)
B)
C)
D)
E)
OH
OH
I
II
III
IV
V
Ans: D
Topic: Functional groups
Section: 2.1, 2.6, 2.8, and 2.10B
Difficulty Level: Hard
V
63. Drawn below is Atropine, found in Atropa belladonna, sometimes used in dilating pupils
during an eye-exam. Which of the following functional groups is NOT in atropine?
N
O
O
OH
Atropine
A)
B)
C)
D)
E)
Amine
Ester
Alcohol
Benzene Ring
Ketone
Ans: E
Topic: Functional groups
Section: 2.6 and 2.10C
Difficulty Level: Medium
64. What functional group(s) is/are present in the following compound?
HO
O
NHCH3
A)
B)
C)
D)
E)
o
1 alcohol and 2o amine
amide and 2o alcohol
nitrile and 1o alcohol
2o amide and ether
None of these
Ans: E
Topic: Functional groups
Section: 2.1, 2.6, 2.7, and 2.10C
Difficulty Level: Medium
65. The compound shown below is a substance called Capsaicin, found in varying
concentrations in several varieties of hot peppers, and responsible for their respective
degrees of “heat”. Which functional groups are present in the molecule of capsaicin?
O
N
H
O
OH
A)
B)
C)
D)
E)
Capsaicin
Alkene, ketone, amine, alcohol, ester
Alkene, ketone, alcohol, ether
Alkene, amine, phenol, ether
Ether, phenol, alkene, amide
Ester, phenol, alkene, amide
Ans: D
Topic: Functional groups
Section: 2.8 and 2.11
Difficulty Level: Medium
66. What functional group(s) is/are present in the following compound?
NC
A)
B)
C)
D)
E)
NHCH3
o
1 amine and 2o amine
amide and 2o amine
2o amine and nitrile
nitrile and 1o amine
amide and nitrile
Ans: C
Topic: Intermolecular forces
Section: 2.13
Difficulty Level: Easy
67.
A)
B)
C)
D)
E)
The strongest of attractive forces is which type?
Dispersion forces
Ion-dipole
Dipole-dipole
Cation-anion
Hydrogen bonds
Ans: D
Topic: Intermolecular forces
Section: 2.13
Difficulty Level: Easy
68.
A)
B)
C)
D)
E)
Which of these is the weakest of the intermolecular attractive forces?
Ion-ion
Dispersion forces
Dipole-dipole
Covalent bonding
Hydrogen bonding
Ans: B
Topic: Intermolecular forces
Section: 2.13
Difficulty Level: Medium
69.
A)
B)
C)
D)
E)
Which compound would you expect to have the highest melting point?
n-Butyl alcohol
Isobutyl alcohol
sec-Butyl alcohol
tert-Butyl alcohol
Diethyl ether
Ans: D
Topic: Intermolecular forces
Section: 2.13
Difficulty Level: Medium
70. Which of the following is not found in the following substance?
CH3CH2CH2CH2CH2OH
A) Ion-ion
B) Dispersion forces
C) Dipole-dipole
D) Covalent bonding
E) Hydrogen bonding
Ans: A
Topic: Intermolecular forces
Section: 2.13
Difficulty Level: Medium
71. Which alkane is predicted to have the highest melting point of those shown?
A) CH3CH2CH2CH3
B) CH3CHCH3
CH3
C) CH3CH2CH2CH2CH3
D) CH3CHCH2CH3
E)
CH3
CH3
CH3CCH3
CH3
Ans: E
Topic: Intermolecular forces
Section: 2.13B
Difficulty Level: Easy
72.
A)
B)
C)
D)
E)
What intermolecular forces hold base pairs together in DNA?
Ion-ion
Dipole-dipole
Hydrogen bonds
Dispersion forces
Covalent bonds
Ans: C
Topic: Intermolecular forces
Section: 2.13C
Difficulty Level: Easy
73. Which compound would you expect to have the lowest boiling point?
NH2
A)
B)
NH2
C)
H
N
D)
N
E)
NH2
Ans: D
Topic: Intermolecular forces
Section: 2.13C
Difficulty Level: Easy
74.
A)
B)
C)
D)
Which of these compounds would have the highest boiling point?
CH3OCH2CH2CH2OCH3
CH3CH2OCH2CH2OCH3
CH3CH2OCH2OCH2CH3
CH3OCH2CHOCH3
CH3
E) HOCH2CH2CH2CH2CH2OH
Ans: E
Topic: Intermolecular forces
Section: 2.13C
Difficulty Level: Easy
75.
A)
B)
C)
D)
E)
Which compound would have the highest boiling point?
CH3CH2CH2CH2CH2CH3
CH3CH2OCH2CH2CH3
CH3CH2CH2CH2CH2OH
CH3CH2OCH(CH3)2
CH3OCH2CH2CH2CH3
Ans: C
Topic: Intermolecular forces
Section: 2.13C
Difficulty Level: Easy
76.
A)
B)
C)
Of the following compounds, the one with the highest boiling point is:
CH3CH3
CH3CH2Cl
CH3C=O
H
D) CH3CH2OH
E) CH3CH2OCH2CH3
Ans: D
Topic: Intermolecular forces
Section: 2.13C
Difficulty Level: Medium
77.
A)
B)
C)
D)
E)
Which compound would you expect to have the highest boiling point?
ethane
ethene
ethyne
bromoethane
methane
Ans: D
Topic: Intermolecular forces
Section: 2.13C
Difficulty Level: Medium
78.
A)
B)
C)
D)
E)
Which compound would you expect to have the highest boiling point?
ethyl alcohol
ethyl amine
chloroethane
water
ethane
Ans: D
Topic: Intermolecular forces
Section: 2.13C
Difficulty Level: Medium
79. Which of these would you expect to have the lowest boiling point?
A) CH3CH2CH2OH
B) CH3CHCH3
OH
C) CH3OCH2CH3
D) CH3CH2CH2CH2OH
E) CH3CH2OCH2CH3
Ans: C
Topic: Intermolecular forces
Section: 2.13C
Difficulty Level: Medium
80. Which compound would you expect to have the lowest boiling point?
O
A)
NH2
H
N
B)
O
O
C)
N
D)
NH2
O
E)
O
N
H
Ans: C
Topic: Intermolecular forces
Section: 2.13C
Difficulty Level: Medium
81.
A)
B)
C)
D)
E)
Which compound would you expect to have the highest boiling point?
CH3OCH2CH2OCH3
CH3OCH2OCH2CH3
HOCH2CH2CH2CH2OH
CH3OCH2CH2CH2OH
(CH3O)2CHCH3
Ans: C
Topic: Intermolecular forces
Section: 2.13C
Difficulty Level: Medium
82. Which compound would have the lowest boiling point?
OH
OH
O
I
II
III
OH
OH
IV
A)
B)
C)
D)
E)
V
I
II
III
IV
V
Ans: A
Topic: Intermolecular forces
Section: 2.13D
Difficulty Level: Easy
83. The solid alkane CH3(CH2)18CH3 is expected to exhibit the greatest solubility in which of
the following solvents?
A) CCl4
B) CH3OH
C) H2O
D) CH3NH2
E) HOCH2CH2OH
Ans: A
Topic: Intermolecular forces
Section: 2.13D
Difficulty Level: Easy
84. The following substance is expected to have low solubility in which of the following
solvent(s)?
O Na
O
A)
B)
C)
D)
E)
CCl4
C2H5OH
CHCl3
CH2OHCH2CH2CH2CH2CH2OH
The given substance is likely to be quite soluble in all of the solvents described.
Ans: A
Topic: IR Spectroscopy
Section: 2.15 and 2.16
Difficulty Level: Easy
85. For the functional group(s) on the following molecule what characteristic IR
absorption(s) would be expected (ignoring C-H absorptions)?
CHO
A)
B)
C)
D)
E)
A peak around 1700 cm-1
A peak around 3300 cm-1
Only normal alkane absorptions
A peak around 2250 cm-1
None of these
Ans: A
Topic: IR Spectroscopy
Section: 2.15 and 2.16
Difficulty Level: Easy
86. For the functional group(s) on the following molecule what characteristic IR
absorption(s) would be expected (ignoring C-H absorptions)?
A)
B)
C)
D)
E)
A peak around 1700 cm-1
A peak around 3300 cm-1
A peak around 1650 cm-1
A peak around 2250 cm-1
None of these
Ans: C
Topic: IR Spectroscopy
Section: 2.15 and 2.16
Difficulty Level: Easy
87. The IR spectrum of which type of compound will not show evidence of hydrogen
bonding?
A) Aldehyde
B) Alcohol
C) Carboxylic acid
D) Phenol
E) Primary amine
Ans: A
Topic: IR Spectroscopy
Section: 2.15 and 2.16
Difficulty Level: Easy
88. The IR spectrum of which type of compound generally exhibits evidence of hydrogen
bonding?
A) Aldehyde
B) Carboxylic acid
C) Alkene
D) Ester
E) Ketone
Ans: B
Topic: IR Spectroscopy
Section: 2.15 and 2.16
Difficulty Level: Easy
89. IR evidence for the presence of the C=C would be most difficult to detect in the case of
which of these alkenes?
A)
B)
C)
D)
E)
Ans: D
Topic: IR Spectroscopy
Section: 2.15 and 2.16
Difficulty Level: Medium
90. An oxygen-containing compound shows strong IR absorption at 1630-1780 cm-1 and
3200-3550 cm-1. What type of compound is it likely to be?
A) An alcohol
B) A carboxylic acid
C) An ether
D) A ketone
E) An aldehyde
Ans: B
Topic: IR Spectroscopy
Section: 2.15 and 2.16
Difficulty Level: Medium
91. For the functional group(s) on the following molecule what characteristic IR
absorption(s) would be expected (ignoring C-H absorptions)?
CN
A)
B)
C)
D)
E)
A peak around 1700 cm-1
A peak around 3300 cm-1
A peak around 1650 cm-1
A peak around 2250 cm-1
None of these
Ans: D
Topic: IR Spectroscopy
Section: 2.15 and 2.16
Difficulty Level: Medium
92. For the functional group(s) on the following molecule, what characteristic IR
absorption(s) would be expected (ignoring C-H absorptions)?
HO
A)
B)
C)
D)
E)
Peaks around 1700 and 1650 cm-1
Peaks around 3300 and 1710 cm-1
Peaks around 1650 and 3300 cm-1
Only a peak around 3300 cm-1
None of these
Ans: C
Topic: IR Spectroscopy
Section: 2.15 and 2.16
Difficulty Level: Medium
93. For the functional group(s) on the following molecule, what characteristic IR
absorption(s) would be expected (ignoring C-H absorptions)?
CO2H
A)
B)
C)
D)
E)
Peaks around 1700 and 1650 cm-1
A strong broad peak over 3600 to 2500 and around 1710 cm-1
Peaks around 1650 and 3300 cm-1
Peaks around 3300 and 1710 cm-1
None of these
Ans: B
Topic: IR Spectroscopy
Section: 2.15 and 2.16
Difficulty Level: Medium
94. For the functional group(s) on the following molecule, what characteristic IR
absorption(s) would be expected (ignoring C-H absorptions)?
Br
A)
B)
C)
D)
E)
Peaks around 1710 and 1650 cm-1
A strong broad peak over 3600 to 2500 cm-1
Peaks around 1650 and 3300 cm-1
A peak around 1710 cm-1
None of these
Ans: E
Topic: IR Spectroscopy
Section: 2.15 and 2.16
Difficulty Level: Medium
95. For the functional group(s) on the following molecule, what characteristic IR
absorption(s) would be expected (ignoring C-H absorptions)?
A)
B)
C)
D)
E)
Peaks around 3300, 2150, and 1650 cm-1
Peaks around 1710 and 1650 cm-1
Peaks around 1650 and 3300 cm-1
A peak around 2250 and 3300 cm-1
None of these
Ans: A
Topic: IR Spectroscopy
Section: 2.15 and 2.16
Difficulty Level: Medium
96. The absorption band for the O-H stretch in the IR spectrum of an alcohol is sharp and
narrow in the case of:
A) a Nujol mull of the alcohol.
B) a concentrated solution of the alcohol.
C) a gas phase spectrum of the alcohol.
D) the spectrum of the neat liquid.
E) none of these
Ans: C
Topic: IR Spectroscopy
Section: 2.15 and 2.16
Difficulty Level: Medium
97. A split peak for the IR absorption due to bond stretching is observed for the carbonyl
group in which of these compounds?
O
A)
CH3CH2CH2COH
O
B)
ca
C)
CH3CH2CCl
O
CH3CH2CNH2
O
D)
CH3CH2COCH2CH3
O O
E)
CH3CH2COCCH2CH3
Ans: E
Topic: IR Spectroscopy
Section: 2.15 and 2.16
Difficulty Level: Medium
98. The IR spectrum of which of the following substances is likely to show a small, but sharp
peak at 2200 cm-1?
OH
O
N
H
II
I
IV
A)
B)
C)
D)
E)
I
II
III
IV
V
Ans: E
Topic: IR Spectroscopy
Section: 2.15 and 2.16
Difficulty Level: Medium
III
V
99.
A)
B)
C)
D)
E)
An anticipated IR absorption band may not be observed because:
it occurs outside the range of the instrument used.
no change occurs in the dipole moment during the vibration.
the absorption band is eclipsed by another.
the intensity is so weak that it cannot be differentiated from instrument noise.
All of these
Ans: E
Topic: IR Spectroscopy
Section: 2.15 and 2.16
Difficulty Level: Hard
100. For the functional group(s) on the following molecule what characteristic IR
absorption(s) would be expected (ignoring C-H absorptions)?
O
O
A)
B)
C)
D)
E)
peaks around 1740 and 1650 cm-1
A strong broad peak over 3600 to 2500 cm-1
peaks around 1650 and 3300 cm-1
a peak around 1740 cm-1
None of these
Ans: D
Topic: IR Spectroscopy
Section: 2.15 and 2.16
Difficulty Level: Hard
101. For the following reaction sequence (it is not necessary to understand the chemistry) what
significant change(s) would be expected by IR (ignoring C-H absorptions)?
a. NaNH 2
b. CH 3CH 2I
A)
B)
C)
D)
E)
A peak around 1710 cm-1 would disappear.
A peak around 1710 cm-1 would appear.
A peak around 2150 cm-1 would disappear.
No change would be observed.
None of these
Ans: C
Topic: IR Spectroscopy
Section: 2.15 and 2.16
Difficulty Level: Hard
102. For the following reaction sequence (it is not necessary to understand the chemistry) what
significant change(s) would be expected by IR (ignoring C-H absorptions)?
O
a. CH3MgBr
OH
b. H3O+
A) A peak around 1710 cm-1 would disappear and a new peak around 3300-3500 cm-1 would
appear.
B) A peak around 1710 cm-1 would appear and a new peak around 1650 cm-1 would
disappear.
C) A peak around 2150 cm-1 would disappear and a new peak around 3300-3500 cm-1 would
appear.
D) No change would be observed.
E) None of these
Ans: A
Topic: IR Spectroscopy
Section: 2.15 and 2.16
Difficulty Level: Hard
103. For the following reaction sequence (it is not necessary to understand the chemistry) what
significant change(s) would be expected by IR (ignoring C-H absorptions)?
OH
a. NaH
OCH3
b. CH3I
A) A peak around 3300 cm-1 would disappear .
B) A peak around 1710 cm-1 would appear and a new peak around 3300 cm-1 would
disappear.
C) A peak around 2150 cm-1 would disappear and a new peak around 3300 cm-1 would
appear.
D) No change would be observed.
E) None of these
Ans: A
Topic: IR Spectroscopy
Section: 2.15 and 2.16
Difficulty Level: Hard
104. For the following reaction sequence (it is not necessary to understand the chemistry) what
significant change(s) would be expected by IR (ignoring C-H absorptions)?
OH
PCC
O
A) A peak around 3300 cm-1 would disappear and nothing new would appear.
B) A peak around 1710 cm-1 would appear and a new peak around 3300 cm-1 would
disappear.
C) A peak around 2150 cm-1 would disappear and a new peak around 3300 cm-1 would
appear.
D) No change would be observed.
E) None of these
Ans: B
Topic: IR Spectroscopy
Section: 2.15 and 2.16
Difficulty Level: Hard
105. For the following reaction sequence (it is not necessary to understand the chemistry) what
significant change(s) would be expected by IR (ignoring C-H absorptions)?
H2, Pd/C
A) A peak around 3300 cm-1 would disappear and nothing new would appear
B) A peak around 1710 cm-1 would appear and a new peak around 3300 cm-1 would
disappear.
C) A peak around 1650 cm-1 would disappear and nothing new would appear.
D) No change would be observed.
E) None of these
Ans: C
Topic: IR Spectroscopy
Section: 2.15 and 2.16
Difficulty Level: Hard
106. For the following reaction sequence (it is not necessary to understand the chemistry) what
significant overall change(s) would be expected by IR (ignoring C-H absorptions)?
1. Br2, light
2. Zn, HCl
A) A peak around 3300 cm-1 would disappear and nothing new would appear.
B) A peak around 1710 cm-1 would appear and a new peak around 3300 cm-1 would
disappear.
C) A peak around 1650 cm-1 would disappear and nothing new would appear.
D) No overall change would be observed.
E) None of these
Ans: D
Topic: IR Spectroscopy
Section: 2.15 and 2.16
Difficulty Level: Hard
107. For the following reaction sequence (it is not necessary to understand the chemistry) what
significant change(s) would be expected by IR (ignoring C-H absorptions)?
CN
a. DiBAl-H
CHO
b. H3O+
A) A peak around 2250 cm-1 would disappear and nothing new would appear.
B) A peak around 1720 cm-1 would appear and a new peak around 3300 cm-1 would
disappear.
C) A peak around 2250 cm-1 would disappear and new peak around 1720 cm-1 would appear.
D) A peak around 2250 cm-1 would disappear and new peak around 3300 cm-1 would appear.
E) No change would be observed.
Ans: C
Topic: IR Spectroscopy
Section: 2.15 and 2.16
Difficulty Level: Hard
108.
A)
B)
C)
D)
E)
The IR stretching frequency occurs at the lowest frequency for which of these bonds?
C–H
C–O
C–Br
C–N
C–F
Ans: C
Topic: IR Spectroscopy
Section: 2.15 and 2.16
Difficulty Level: Hard
109. The IR stretching frequency can be predicted to occur at the highest frequency for which
of these bonds?
A) C–H
B) C–F
C) C–Cl
D) C–Br
E) C–I
Ans: A
Topic: IR Spectroscopy
Section: 2.15 and 2.16
Difficulty Level: Hard
110. The IR absorption due to the stretching of which of these carbon-hydrogen bonds occurs
at the highest frequency?
H
H
H
I
II
III
H
IV
A)
B)
C)
D)
E)
I
II
III
IV
V
Ans: E
Topic: IR Spectroscopy
Section: 2.15 and 2.16
Difficulty Level: Hard
H
V
111. An oxygen-containing compound which shows sharp IR absorption at 2200 cm-1 and
3300 cm-1 is likely to be what type of compound?
A) An ester
B) An alkene
C) An alkyne
D) An ether
E) An aldehyde
Ans: C
SHORT ANSWER QUESTIONS
Topic: Functional Groups
Section: 2.1
Difficulty Level: Easy
112. Hydrocarbons containing carbon-carbon double bonds are referred to as ___________.
Ans: alkenes
Topic: Functional Groups
Section: 2.1
Difficulty Level: Easy
113. Unsaturated hydrocarbons may be distinguished from saturated hydrocarbons by the
presence of one or more _____________.
Ans: Pi bonds
Topic: Isomers, Functional Groups
Section: 2.1
Difficulty Level: Easy
114. Draw a structural formula for C8H18 , in which there are two quaternary carbons.
Ans:
Topic: General
Section: 2.1
Difficulty Level: Easy
115. The six p-electrons in benzene are _____________ about the ring, which explains why all
of the C-C bonds are the same length.
Ans: delocalized
Topic: Isomers, Functional Groups
Section: 1.3A and 2.1
Difficulty Level: Easy
116. Draw all isomers of C6H14.
Ans:
Topic: General
Section: 2.2
Difficulty Level: Easy
117. A polar covalent bond is one in which electrons are _____________.
Ans: not shared equally
Topic: Molecular Geometry, Dipole Moment
Section: 2.2 and 2.3
Difficulty Level: Medium
118. Carbon dioxide is non-polar, despite the fact that oxygen is much more electronegative
than carbon. Briefly explain why, using relevant diagrams as appropriate to illustrate
your Answer.
Ans: The overall dipole moment of a polyatomic molecule depends on two factors: the
polarity of various bonds and molecular geometry, since dipole forces have both
magnitude and direction. In some molecules containing bonds of identical polarity,
the molecular geometry may result in a net cancellation of the overall dipole forces.
This is what happens in carbon dioxide: although there are two polar C-O bonds,
because of the linear geometry of the molecule, the net dipole is zero.
..
..
: O C O:
Topic: Functional Groups
Section: 2.4
Difficulty Level: Easy
119. Organic compounds are classified into chemical families on the basis of similarities in
chemical properties; these similarities are primarily due to the presence of characteristic
arrangements of atoms known as ________________.
Ans: functional groups
Topic: Isomers, Functional Groups
Section: 1.3A, 2.6, and 2.7
Difficulty Level: Easy
120. Draw all isomers of C3H8O and classify each according to functional group.
OH
Ans:
C3H8O
OH
O
primary alcohol
secondary alcohol
ether
Topic: Isomers, Functional Groups
Section: 1.3A and 2.8
Difficulty Level: Medium
121. Draw all tertiary amine isomers of C6H15N.
Ans:
N
N
N
N
N
N
Topic: Functional Groups
Section: 2.9
Difficulty Level: Easy
122. A group in which a carbon atom has a double bond to an oxygen atom is called a
__________.
Ans: carbonyl
Topic: Isomers, Functional Groups
Section: 2.9
Difficulty Level: Easy
123. Draw all isomers of C6H12O that are aldehydes and contain at least one secondary carbon.
Ans:
O
O
O
O
Topic: Isomers, Functional Groups
Section: 1.3A and 2.9
Difficulty Level: Easy
124. Draw all isomers of C6H12O that are aldehydes.
Ans:
O
O
O
O
O
O
O
Topic: Isomers, Functional Groups
Section: 1.3A and 2.9
Difficulty Level: Easy
125. Draw all isomers of C5H10O that are ketones.
O
O
O
Ans:
Topic: Intermolecular Forces
Section: 2.13C
Difficulty Level: Easy
126. Ethanol, C2H5OH, and propane, C3H8, have approximately the same molar mass, yet
ethanol has a much higher boiling point. Briefly explain why.
Ans: Strong hydrogen bonding between molecules of ethanol leads to elevation in
boiling point. No hydrogen bonding is possible between molecules of propane,
resulting in a lower boiling point compared with ethanol.
Topic: Intermolecular Forces
Section: 2.13C
Difficulty Level: Easy
127. Ethanol, C2H5OH, and dimethyl ether, CH3OCH3, have the same molar mass, yet ethanol
has a much higher boiling point. Briefly explain why.
Ans: Strong hydrogen bonding between molecules of ethanol leads to elevation in
boiling point. No hydrogen bonding is possible between molecules of dimethyl
ether, resulting in a lower boiling point compared with ethanol.
Topic: Bonding, Solubility
Section: 2.13 specifically 2.13D
Difficulty Level: Medium
128. Sodium chloride, which is quite soluble in water, is not very soluble in hexane. Why?
Ans: Sodium chloride, which is an ionic substance, is soluble in a polar solvent such as
water, but not in a non-polar solvent such as hexane.
Topic: Functional Groups, IR Spectroscopy
Section: 2.15 and 2.16
Difficulty Level: Medium
129. Examine the following IR spectrum, for substance P (C8H22O). Which oxygen
containing functional group is present in P?
Ans: An aldehyde
Topic: Functional Groups, IR Spectroscopy
Section: 2.15 and 2.16
Difficulty Level: Medium
130. Examine the following IR spectrum, for substance P (C5H12O). Which oxygen
containing functional group is present in P?
Ans: Alcohol
Topic: IR Spectroscopy
Section: 2.15 and 2.16
Difficulty Level: Hard
131. The IR absorption frequencies of the C-H bond in alkanes, alkenes and alkynes are
measurably different. Briefly explain why.
Ans: IR absorption frequency depends on bond strength; the bond strength of C-H bonds
in alkanes, alkenes and alkynes is different because different atomic orbitals
(hybridized) of carbon are involved in the bond: the C-H bond in alkanes is
described as (sp3-s), that in alkenes is (sp2-s) and in alkynes, it is (sp-s). The
relative % s v. % p character of the hybrid orbitals of carbon would indicate
different bond lengths / bond strengths for alkanes, alkenes and alkynes, with the
bond length / bond strength being the longest/weakest respectively. This results in
different IR absorption frequencies.
Topic: IR Spectroscopy
Section: 2.15 and 2.16
Difficulty Level: Medium
132. IR absorption signals of alcohols are typically broad. However, IR spectra of gaseous
samples show sharp peaks. Briefly explain why.
Ans: Broad signals of alcohols are due to hydrogen bonding associated with the O-H
group. In gaseous samples, no hydrogen bonding is possible, and the signal
becomes sharp.
Topic: Functional Groups, IR Spectroscopy
Section: 2.1, 2.15, and 2.16
Difficulty Level: Easy
133. An IR spectrum has significant peaks at 3080 and 1650 cm-1. What functional group is
present in the molecule?
Ans: An alkene
Topic: Functional Groups, IR Spectroscopy
Section: 2.1, 2.15, and 2.16
Difficulty Level: Hard
134. An IR spectrum has significant peaks at 2200 and 3300 cm-1. What functional group is
present in the molecule?
Ans: A terminal alkyne